UID Changeable Mifare Ultralight Card.
It can be modified with the Official ACR122U Reader.

Mifare Ultralight 7 Byte UID Changeable Magic Card

White Card

Mifare Ultralight 7 Byte UID Changeable Magic Card

(2 Reviews) $4.99 $69.99
Mifare Ultralight 7 Byte UID Changeable Key Fob

Key Fob

Mifare Ultralight 7 Byte UID Changeable Key Fob

(2 Reviews) $4.99 $69.99